Offset keyway gauge



June 13, 1944. A. J. CASALI OFFSET KEYWAY GAUGE- Filed' Oct. 14, 1943 ii' Jz 3mm Jul/wry .lfaaalz' 558w; gyg

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Patented June 13, 1944 UNITED STATES PATENT OFFICE;

l I 2,351,105 I I I OFFSET KEYWAY GAUGE Anthony J. Casali, Canton, Ohio Application October 14, 1943, Serial No. 506,151

4 Claims. (01. 33-462) use of the members precludes rotating one member on the otherv as is ordinarily done in order to line up the keyways. may be a gear which must be secured to the other For instance, one member member or shaftin a fixed position in order to -mesh accurately with another gear or rack, or

the one member may be a crank arm, the outer end of which must be held in a. certain radial position relative to the shaft. In such cases the two members can not be rotated relative to each other for the purposes of lining up the keyways.

Thus in order to save making one of the members over, an offset key is usually made to fit accurately the two keyways which are offset with respect to each other. gauge accurately the dimensions for such an offset However, it is diflicult to key, and particularly diflicult to gauge the amount ,of the offset between the two keyways in the members to be keyed together.

It is therefore an object of the present invention to provide a novel and improved gauge for determining accurately the dimensions of an offset key required to key'two members together having keyways which do not line up with each other.

Another object is to provied a novel offset keyway gauge which is adapted to measure accurately the widths of offset keyways in two members to be connected together.

A further object is gauge which is adapted quickly to be applied to offset keyways for determining the dimensions of both the keyways and the offsets therebetween, thus saving time and labor.

Another object is to provide an improved offset keyway gauge construction which is equally well adapted to be made for either right or left offsets.

\A still further object is to provide a novel offset keyway gauge which is simple, compact and economical of construction.

These and other objects are attained by the parts, improvements and combinations comprising the present invention, which may be stated in general terms as including wedge pieces slidably to provide an offset keyway dovetailed together for endwise movement and 55 r Fig. 11 is a plan view of a left hand of the novel offset keyway gauge;

'2 and 3 has a gauge face ends and its opposite side or face It is inclined and has a dovetail rib having outer parallel gauge faces, one of said wedge pieces having a tapered longitudinal slot in its upper portion slidably receiving a tapered gauge ba'rwhich is adapted to extend laterally beyond the gauge face of said wedge piece.

Referring to the drawing herein in which a preferred embodiment of the inventionis shown by way of example,

Figure 1 is a plan view of one of the wedge pieces embodied in the novel gauge;

Fig. 2 is an end view thereof; Fig. 3 isan opposite end view thereof; Fig. 4 is a plan view of the other wedge piece adapted to dovetail with the wedge piece of Fig. 1; Fig. 5 is an end view thereof; Fig. 6 is an opposite end view thereof; Fig. 7 is a plan view of the gauge bar which is slidably received in a slotin the wedge piece of Fig. 4; a

Fig. 8 is a plan view of the parts of Figs. 1, 4 and '1 assembled to form a right hand embodiment of the novel offset keyway gauge;

Fig. 9 is an end view thereof; Fig. 10 is a side view thereof;

embodiment Fig. 12 is an end view thereof; i Fig. 13 is a fragmentary sectional view showing the right hand gauge of Figs. 8 and 9 inserted into the offset keyway portions of'two members to be securedor keyed together. Similar numerals refer to similar parts throughout the several views of the drawing.

' The wedge piece l4 shown detached in Figs. 1, 15 at right angles to it's 11 projecting therefrom.

The wedge piece l8 shown detached in Figs. 4, 5 and 6 has a gauge face l9 at right angles to its ends and its opposite side or face 20 is inclined to mate with inclined face l6 of wedge piece l4 and has a dovetail groove 2| for-slidably receiving the rib 11.

Thus when the wedge pieces l4 and I8 are slidably engaged by inserting rib l1 endwise into groove 2|, the gauge faces 15 and [9 are always parallel during relative endwise movement of the wedge pieces which varies the distance between the gauge faces or the overall width of the wedge pieces.

Preferably the bottom surfaces of wedge pieces l4 and I8 are substantially in the same plane when the two pieces are slidably engaged as shown in Figs. 9 and 13. The upper portion 22 of wedge piece 18 preferably projects above the upper surface of piece M, the height of piece l4 the edge 9i of the bar moves laterally and-12 is used. .The left being slightly less than the depth of the usual keyway 23 provided in a shaft 24 or like member for which the gauge is designed. Thus the upwardly projecting portion 22 projects into the keyway 25 in the member 26 which is to be keyed to the shaft 24, as shown in Fig. 13.

The portion 22 is provided with a longitudinally extending slot 21 parallel with the bottom surface of wedge piece I8 and the inner wall 28 of the slot being inclined to be parallel with the inclined races; 20} and I6. A gauge bar 29 is adapted to 'be slidably received in said slot 21 and the opposite side edges 30 and 3| are inclined to each other at the same angle as the opposite faces I9 and 20, so that when the edge 30 engages the inner wall 28 of slot 21 the opposite edge 3| is parallel with the gauge face I9. As shown in Fig. 8, as the gauge bar 29 longitudinally in slot 21 with the edge 30 slidably wedgably engaging the inner wall 28 of the slot, relative towedge piece I8 but said edge: 3,I is always pa-rallel-to the gauge face {-9- thereof.

In. the operation of the improved gauge if the member. 2 8.- when fitted onthe shaft 2-4 does not have itswkeyway portion-25 lined. up with keyway portion--23, andv assuming that the member 26 is a gear or crank arm which cannot be rotated on. the-shaft, then it becomes: necessary to make an offset keytofit, the offset; keyway portions of members 24 and 2B in. order to avoid making over one of the; members. 26=is-o1fset clockwise relatiye to member 24: as shown in. Fig. 13; the. right hand gauge shown in Figs. 1 to 10 inclusive: is used; if the offset is the other way the-left. hand gauge; shown in Figs. 11 .hand gauge comprises the wedge pieces. I412 I81: and gauge bar 29d, which are identical with parts I4, I8 and Hex.- cept that they are of the: opposite: hand.

order to determine; accurately the;- dimensions of the offset key required; for. the; keyways 23 and 25, the gaugeis inserted. asshown. in Fig. 13 and the wedge pieces-I4 and I8 moved. endwise; relative to each other'until: the gauge faces I5 and I9 engage the sides of keyway 2:3; The gauge bar 29 is then moved: lengthwise in slot. 21 until its-edge: 32I projects laterallybeyond gauge face I19 and engages the adjacent.- offset wall of keyway' 25.. ,Preferablygauge bar 29- is provided with graduation .marks 33-to: indicate the relative longitudinal position of the gauge bar 29 when its edgez31. engages keyway 25.. I

On removing; thegauge from the: keywa-y, the

amount. of offset between. the keyways 23c and; 25

is easily and quickly determined from the gauge, whereas it will. be obvious that the measurement is moved If the outer member portions. of: two members of the other said keyw'ay of the exact amount of offset between the keyways is otherwise very difiicult and awkward to obtain. If desired the width of the keyways is easily determined by the use of the-gauge, merely by measuring the distance between gauge faces I 5 and I9 when they engage the sides of the keyway 23.

The improved gauge is simple, compact and economical of construction, as well as being extremely easy to use in saving time and labor.

I claim: I Y

1. An ofiset keyway gauge including a pair of wedge-shaped pieces slidably engaged at their inner faces for endwise movement and having outer parallel gauge faces, one of said wedge pieces having an upwardly projecting portion and having a tapered longitudinally extending horizontallydisposed slot in said upwardly propiece.

2. An offset keyway gauge including a pair of wedge-shaped piecesslidably engaged for endwise movement-relative to' each other, a gauge .bar; andmeans: in. an upper portion of one of said Wedge-shaped pieces slida'bly engaging said gaugebar for extending: one edge: thereof latererally beyond said one wedge-shaped piece as the bar is moved lengthwise therein.

3; A gauge'adapted: for gauging offset keyway portions or two :members to. be keyed together, said gauge including. two wedgepieces slidably engaging-each other. for relative endwi'semove-.- ment and having outer gauge faces: adaptedfor engaging the sides; ofone said keyway portion, and a gauge .bar having sliding wedge engagement. with. one of said: wedge pieces for being extended laterally beyond" said one wedge piece to. engage an offset side of the other said. key-- way portion;

4. A gauge adaptedfor gaugingoffset keyway to be .keyed together, said gauge including two wedge pieces sl idably engaging each other forrelative endwise movement and having outer: gau'ge faces: adapted for engaging the sides of one said keyway portion,

one of said wedge pieces havingan upwardly projecting portion, and a gauge bar having sliding. wedge engagement witlr said; upwardly projecting portion whereby endwi'se movementof said gauge bar moves the outer edge thereof laterally beyond said one wedgepiece. for engaging an ofiset side portions r J. CASALI. 

